Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)²
Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)⁴

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Machine Design
Turn buckle has

No threads
Left hand threads on one end and right hand threads on other end
Left hand threads on both ends
Right hand threads on bout ends

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Machine Design
Set screws are

Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Used to prevent relative motion between parts
Slotted for a screw driver and generally used with a nut

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